Centrifugal pump



w. J. GEAR CENTRIFUGAL PUMP July 9, 1940.

Filed Aug. 5, 1938 Wa/fer Gean 3&3 M I amma,

' description when considered in connection the casing section 5 is a tubular housing III for Patented July 9, 1940 PATENT OFFICE can'ramuosr. rum

"Walter J. Gear, Madera, Calif., assignor of onehalf to Glenn M. Freeman, Madera, Calif.

Application August 5, 193a, sci-a1 No. 223,344

3 Claims.

This invention relates to centrifugal pumps of the single inlet type adapted for dredging and conveying solids such as sand and gravel.

The primary object of the present invention is to provide a simple and highly eflicient pump of the above kind which wfll have a long period of continued usefulness, that will not require priming, and whose operation requires the expenditure of a minimum amount of power.

More particularly, the present invention contemplates the provision of a pump of the above kind wherein most of the wear is limited to the peripheral wall or'the pump casing means being provided to keep the drive shaft bearing and the space between the impeller and the sides of the pump casing clear of the sand and other solid so .as to not be submitted tothe abrading action thereof. 7 1

Other objects and features of the present mvention will become apparent from the following with the accompanying drawing.

In the drawing:

Figure 1 is an edge elevational view of a centrifugal pump constructed in accordance with the present invention, the pump'being mounted upon a suitable support and provided with suitable'driving means. a

Figure 2 is a side elevational view of the pump loolnng toward the left of Figure 1.

Figure 3 is an enlarged transverse section taken substantially on line 3-3 of Figure 2; and

Figure 4 isa view of the impeller partly in side elevation and partly broken away and in section,

as seen looking toward the right side of the impeller as shown in Figure 3.

Referring in detail to the drawing, the present centrifugal pump includes a casing composed of pan-shaped half sections 5 and 5a; flanged along their adjacent edges as at 6 and 6a and having such flanges bolted together as at I. The casing has a peripheral outlet half of which is formed integral with each of the respective casing sections as at 8 and 8a. Formed integral with the casing section la is a tubular inlet 9 disposed axially of the casing, and formed integral with the impeller shaft I I which is journaled at its inner end in a suitable bearing I2 mounted in the housing I0. The section in of thecasing is formed with. an inwardly projecting flange l3 in surrounding relation to the inlet passage, and] the area of the latter passage is somewhat smaller than that of the peripheral outlet for a purpose which will presently be explained. The central relation to the inlet'II and housing III, for a purpose which will also be presently described.

The present pump further includes an impeller or rotor which includes two spaced disks I5 and I50 rigidly connected by impeller blades I6 which incline outwardly and backwardly with respect to the rotation of the impeller as illustrated clearlyin Figure 4, so'as to effectively draw the conveyed material inwardly through the inlet 9 and force the same outwardly to the peripheral wall of the casing for ultimate passage outwardly through the casing outlet 8, 8a. The disk I5 has a central hub I! to which the inner end of drive shaft II is secured, and said disk It is further-provided with a series of openings l8 directly adjacent and surrounding the huh I! inwardly of the blades I6. Disk I511 has a relatively large central opening I! and is provided in surrounding relation to this opening with an outwardly projecting flange 20 that surrounds the inlet flange I3 in spaced relation to the latter and to the adjacent side of the pump casing. The bearing I2 maintains the disk IS in proper spaced relation to the opposite side of the pump casing as shown clearly in Figure 3. Provided on the other sides of the disks I5 and I So are further narrower blades 2| and 2 la which are inclined outwardly and forwardly with respect to the direction of rotation of the impeller, as is also clearly shown in Figure 4. These blades 2| and 2h: extend from the outer periphery of the impeller to a point outwardly of the openings I8 of disk I5 and the flange 20 of disk lid, and their purpose is'to direct the clear water which enters the casing through the small side apertures I4 and Ila, inwardly through the open-' ings I8 of disk l5 and inwardly to the central opening IQ of disk I511. In this way, the bearing I2 is kept clear of sand and other solids, and likewise with respect to the spaces between the sides of the pump casing and the sides of the impeller. Theseparts are thus not subjected to material wear by, reason of the abrading action of these solids, and the latter are kept within the impeller so that the only portion of the pump subjected to a great amount of wear and abrading action from the solids is the peripheral wall of the casing. This peripheral wall is composed of outwardly converging wall portions and preferably lined with wear-resisting material such as removable liner plates 22 and 22a of hard metal which may be readily renewed from time to time as found necessary. It will thus be apparent that the pump will have a relatively long continued period of usefulness. The outlet, of the pump is made of greater area than the inlet so as to take care of the additional water drawn in through the openings l4 and [4a and delivered to the outlet along with the water and solids drawn inward- 1y through the inlet 9. In use, the pump is wholly or partially submerged so that the water may enter the openings l4 and Ma ,and partly or wholly fill the casing so that the pump will not require priming. It has been found that a pump of this construction is highly efiicient in operation and requires the expenditure of a very small amount of power to operate the same. The pump may be mounted on a suitable support 23 by fastening the drive shaft housing I 0 thereto as at 24, the drive shaft ll projecting at the end of the housing III which is uppermost in use of the pump for being operatively connected to a driving motor by any suitable means such as a belt gearing including a pulley 25 secured on this projecting end of shaft ll.

From the foregoing description, it is believed that the construction and operation, as well as the advantages of the present invention will be readily understood and appreciated by those skilled in the art. Minor changes in the specific details illustrated and described, are contemplated within the spirit and scope of the invention as claimed.

What I claim as new is:

1. A centrifugal pump adapted to be at least partially submerged. in use and comprising a casing having a peripheral outlet and provided at one side with an axial inlet, an impeller arranged within the casing including spaced disks connected by tangential blades inclining outwardly and cent said further blades so that the latter may force clear water inwardly toward the axis of the pump.

2. A centrifugal pump adapted to be at least partially submerged in use and comprising a casing having a peripheral outlet and provided at one side with an axial inlet, an impeller arranged within the casing including spaced disks connected vby tangential blades inclining outwardly and backwa-rdly with respect to the direction of rotation of the impeller, said disks being spaced from the sides of the casing and having further tangential blades on the outer sides thereof inclined forwardly with respect to the direction of rotation of the impeller, said casing further having relatively small water inlet openings through the sides thereof adjacent the center of the same, said water inlet openings being in the portion of the casing adjacent said further blades so that the latter may force clear water inwardly toward the axis of the pump, the side of the casing opposite that provided with the inlet having a bearing, and a drive shaft for the impeller journaled in said bearing and attached to the adjacent one of said disks, the'last-named disk having openings therethrough in surrounding adjacent relation to said shaft, the other disk having an outward flange and a central opening surrounded thereby considerably larger than said inlet, and an inwardly projecting flange extending into the last-named flange but spaced from the latter in surrounding relation to said inlet.

3. A centrifugal pump adapted to be at least partially submerged in useand comprising 9. casing having a peripheral outletand provided with an axial inlet in, one side thereof, an impeller arranged in the casing and including spaced disks connected by blades, means permitting passage of water through saiddisks inwardly of said blades, the sides of the casing having perforations adjacent the center thereof for the admission of clear water, and further blades on the outer sides of said disk for forcing said clear water inwardly toward the axis of the pump and between the disks, said perforations being in the portion of the casing adjacent said further blades so that the latter may force clear water inwardly toward theaxis of the pump.

' WALTER J. GEAR. 

